Attachment for carbureters.



J. B. LUND.

ATTACHMENT FOR CARBPRETERS.

APPLICATION FILED DEG. 1B, 1911.

Patented Feb. 13, 1912.

To all whom it may concern:

UNITED STATES PATENT OFFICE.

nrrncminrrr ron cnammnrnas.

Specification of Letters Patent. Patented Feb, Application filed December 18, 1911. Serial No. 866,814.

and connected therewith at intervals by radial ribs or partitions 16. The d Be it known that I, JAMES B. LUND, a

the compartments formed by the citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useo air into the compartments and the partiful Improvements in Attachments for Cartions are cut away at their central ortions bureters, of which the following is a specito leave a central chamber surroun ing the pipe 13 and communicating with the air suppl pipe 11. The air which is drawn into t e heater at both ends thereof is heated by the pipe 13 and the radial partitions 16 to a relatively high temperature before it is delivered to the carbureter through the supply pipe 11.

fication.

This invention relates to carbureter attachments and aims to provide means whereby the temperature of the gas delivered from the carbureter to the engine cylinders is automatically controlled.

It is well known that communicating directly phere. A shutter 18 hlnged at 19 ad acent one side of the port is adapted, when in elevated position, to close the port and when in lowered, position to close the pipe 11 between the port andthe heater. It will be that whenthe shutter ispartially for the carbureter, one for hot air and the other for cold and controllin the proportions of air admitted through t rough t e eater 12. y regulating the eac opening by an element sensitive toboth position of the shutter the proper roportemperature and pressure located in the mix- -t-ions of hot and cold air Wlll be a mitted ture pipe between the carbureter and the through the heater and the port 17 respecen ne.

considered in connection with the accomture to the cylinders of a required predeteranying drawings illustrating one preferred mined temperature.

orm o the invention. 7 s s own in Fig. 1 the pipe leading from ferring to the drawings-Figure 1 is a the carbureter to the manifold 20 connected awa 1sa sectional view taken he engine 0 linders in the usual way is enlarged as indicated at 21 to accommodate a pressure and temperature controlled element 22. While I do not desire to limit Fig. 3 the invention to an any onteline33of 1.1.

On the drawings 8 designates a'carbu'reter of any well known or referred type nipped with the usual throttle valve 9 a apted to be controlled in the usual way b the driver through the instrumentality the connecting re 10. The to the carb I 11 connected at its intake comprises a section of p the exhaust pipe 14 win he engine-and having a drum 15 surrounding the section mg of accordion construction to permit expension and contraction of the element in a ongitudinal direction. The element 22 is adapted to expand upon reduction of the ressure thereon and under the influenoe of heat and to contract under the infiuence of an increased external ressure or erature. A aring 23 m the side of the enipe 13 interposed in i a decrease in tem projects laterally lar section of p'pe 21 and in this bearing is sli dably mounted a link or rod 24 attache at its inner end to the free end of the element 22 and at its outer end to one arm of a bell-crank lever 25 pivotally mounted upon a suitable stationary bracket 26. The other arm of the bell-crank lever 25 is connected by a link 27 with the shutter 18. The rod 24: is preferably provided with a 'oint 28 to ermlt movements of its outer en in an arc defined by the bell-crank lever and the length of the rod may be regulated to secure the proper adjustment between the element 22 and the shutter by means of a turn-buckle connection 29. It will be evidentthatas the element 22 expands, either by reason of a rise in temperature of the mixture delivered from the carbureter or by reason of increased vacuum in the pipe caused by throttling the engine, the shutter 18 will be moved toward the dotted line position shown in Fig. 1 to decrease the supply of heated air drawn in through the heater 12 and increase the supply of cool air drawn directly from the atmosphere through the port 17. Thus it will be seen that by accurately regulating the position of the shutter 18 the temperature of the mixture delivered by the carbureter is automatically controlled and the most efiicient explosive mixture is delivered at all times to the engine.

It has been determined that the most satisfactory and eflicient operation of an engine can be obtained when the mixture is delivered to the cylinders at a tem erature ran ing between 95 and 100 F. hen the englne is running under ordinary conditions with the throttle open about 35 of heat is expended in the carbureter in evaporating the gasolene, consequently there is a difference in temperature of about 35 between the air in the pipe 11 before it enters the carbureter and the mixture in the ipe 21 delivered from the carbureter. It 18, therefore, desirable to maintain the air in the intake pipe at a temperature of about 130 to 135 F In assembling the device the various parts are so adjuste that under ordinary atmospheric pressure a temperature slightly above 100 will be maintained in the pipe 21. In actual operation, however, the pressure in the ipe 21 is always slightly below atmospheric pressure even when t e engine is runnin .with the throttle wide open and the expansion of the element 22 caused by this decrease in ressure will cause the shutter to close the -ot air inlet sufiiciently to maintain a running temperature around the element at a point between 95 and 100. So long as the throttle remains open the thermostatic action of the element 22 will maintain a substantially uniform temperature of the mixturebeing delivered to the cylinders.

When the engine is with the throttle partially or nearly closed, however, the pressure around t e element will be decreased or, in other words, the vacuum will be increased. The decrease in pressure will, of course, cause the element to expand thereby shutting down the supply of heated air from the heater 12. This action would tend to reduce the temperature of the mixture beyond the required amounts were it not for the fact that when the throttle is closed the vacuum below the throttle or in the carbureter is decreased and the air in the carbureter being under greater pressure will vaporize a correspondingly smaller amount of liquid and lose a proportionately less number of heat units in the act of vaporization. The result is that the mixture de ivered to the cylinder is. of the proper temperature. It is a well known fact that there is a tendency for the carbureter to flood when the engine is throttled and, with carbureters not equipped with my invention, when the throttle is suddenly opened a considerable quantity of asolene poorly and inade uately vaporizer? is sucked directly into tie cylinder thereby causing rag ed explosions and a dense smoke heavily la en with carbon to issue from the exhaust. With my present invention, however, when the throttle is suddenly opened the ressure in the chamber 21 surrounding the element will immediately rise to approximately atmospheric piessure. This incr ase of pressure will cause the element to instantaneously contract so as to throw, the shutter 19 over the cold air port 17 thereby admitting highly heated air to the carbureter. This highly heated air, the temperature of which is above-that normally required, will lose a considerable portion of its heat in vaporizing the excess asolene which has accumulated in the car ureter while the engine was throttled and when this air reaches the cylinders it will be found to be of approximately the desired temperature. This sudden infiux of hot air when the throttle is o ened is of great importance in that the highly heated air will quickly evaporate the excess or accumulation of gasolene in the flooded carbureter thereby reventing the asolene from being drawn into the cylin-.

ers in a oorly vaporized condition. The result is t at the engine will pick up without any ragged or imperfect explosions and without producing a heavy carbon laden exhaust. As soon as the excess of gasolene in the carbureter has been evaporated the temperature of the mixture delivered to the manifold will rise, whereu on the element 22 will expand under the mfiuence of the 121i throttle remains actuate the element 7 tail the embodiments of my sirable,

' livered to the cy the temsprature of t ermostatically tromthe element 22.

that the temperature of the mixture elinders is controlled thermostatically from the element 22 so long as the one position and the pressure around the element con uently remains constant but that, when the ottle is suddenly closed or suddenly opened, the variations in pressure in the ipe 21 will a 22 to assist in maintaming predetermined temdperature.

While I have shown and escribed in deinvention which at the present time, to be most deit will be apparent that various changes in the shape, construction and arrangement of the various parts may be reappear,

sorted to without departing-from the spirit or sacrificing any; of the material advanto es of the invention;

operation he subject-matter which is disclosed in this application and not claimed therein, to wit: the thermostatic regulation alone, forms the subject-matter of my copending ggpllication, Serial No. 636,833, filed July 5,

,I claim: a 1. The combination of a carburetor, a pipe adapted to connect said carbureter with an engine manifold, and means adapted to be actuated by temperature and pressure forautomati y regulating the temperature of the mixture delivered from, said carburetor through said pipe.

2. The combination of a carburetor, an air intake pipe connected therewith, a shutter disposed in said pipe for controlling the relative pro(portions of hot and cold air delivered to sai carburetor, and means actuated by variations in temperature and pressure folautomatically controlling the v p of said shutter.

3. The combination of a carburetor, an air intake pipe connected therewith and rovided with a cold air inlet port, means or heating the air drawn into the end of said.pipe, and temperature and pressure means for automaticall regulathot and co d air adamant:

mitted to said pipe whereby temperature of e mixture said carbureter.

4:.The combination of a carburetor, an air intake pipe connected therewith and rovided with a cold air port, an air heatmg device connected with said pipe, a shutdelivered from ter adapted to vary the relative r0p ortions of air admitted through said eating device and through said port, and a heat and pressure controlled evice for automatically controlling the operation of sai shutter to regulate the temperature of the mixture delivered from said carburetor.

5. The combination of a carburetor, an air supply pipe therefor provided with a port communicating directly with the atmosphere, an air heating device attached to the end of said pi e, and thermostatically and pressure contro ed means positioned to be influenced by the temperature and pressure of the mixture delivered from said carbureter whereby the said of a carburetor, a ipe for supplying air aving a plurality of air inlet passages, one

of said passages communicating direct y with the atmosphere and another with an air heating device, a shutter mounted to control the proportions of cool and heated air drawn into said pipe, and a thermostatic device adapted to be actuated by tempera 'ture and pressure variations connectedwith said shutter for automatically controlling the operation of the shutter.

7. The combination of a carbureter, a

pipe for supplying air theretoprovided with coolan ot air inlet passages, a pressure and temperature controlled device located in the path of the mixture delivered from said carburetor, and means operated by said device for regulating the relative proportions of hot and cool air admitted to said pipe whereby to trol the temperature of livered by the carbureter.

JAMES B. LU'ND.

the mixture deto control the I automatically con- 

